The correct answer is (c), the Krishna-Godavari delta region.
The Krishna-Godavari delta region is a large, fertile plain located in the southeastern part of India. It is formed by the confluence of the Krishna and Godavari rivers, and is one of the most important agricultural regions in the country. The region is known for its production of rice, cotton, and sugarcane.
The Ganga-Sindhu plain region is another important agricultural region in India. However, it is not as well-suited for rice cultivation as the Krishna-Godavari delta region. The North-Eastern region is a mountainous region with a relatively small population. It is not a major agricultural region. Kerala and Tamil Nadu are two states located on the southern coast of India. They are both important agricultural regions, but they are not known for their production of rice.
In conclusion, the Krishna-Godavari delta region is the correct answer to the question “Which part of the following is called the ‘rice bowl’?”.